166369 divided by 42 
Let's see how many times 42 fits into 166369.

Step 1:
The number 42 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (6) from the dividend to 1 and continue with: 16 / 42

Step 2:
If we divide 16 by 42, we get 0 and a remainder of 16.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 16 leaves us with 16.
Include the next digit (6) from the dividend after 16, then repeat: 166 / 42

Going ahead to step 3:
42 can be fit into 166 3 times, resulting in a remainder of 40.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 126 from 166 to get 40.
Fetch the next digit (3) from the dividend, attach it to 40 and continue: 403 / 42

Advancing to step 4:
42 can be fit into 403 9 times, resulting in a remainder of 25.
Put 9 as the next digit of the answer. 
Result so far: 39.0
Subtracting 378 from 403 leaves us with 25.
Take the next digit (6) from the dividend and append it to 25, then repeat: 256 / 42

Let's proceed to step 5:
If we divide 256 by 42, we get 6 and a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 396.0
Subtract 252 from 256 to get 4.
Take the next digit (9) from the dividend and append it to 4, then repeat: 49 / 42

Step 6:
If we divide 49 by 42, we get 1 and a remainder of 7.
The next digit of our result is 1. 
Result so far: 3961.0
Subtracting 42 from 49 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 7:
If we divide 70 by 42, we get 1 and a remainder of 28.
Put 1 as the next digit of the answer. 
Result so far: 3961.1
If we take 42 away from 70, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 8:
42 goes into 280 6 times with a remainder of 28.
The number 6 becomes the next digit in our result. 
Result so far: 3961.16
Deduct 252 from 280 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 9:
If we divide 280 by 42, we get 6 and a remainder of 28.
The next digit of our result is 6. 
Result so far: 3961.166
Deduct 252 from 280 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

The final outcome is 3961.166, with a leftover of 0.0028.